class Calculator(object):
    def __init__(self,number):
        self.number = number
    def __add__(self,other):
        self.number = self.number + other
        return self.number
    def __sub__(self,other):
        self.number = self.number - other
        return self.number
    def __mul__(self,other):
        self.number = self.number * other
        return self.number
    def __truediv__(self,other):
        self.number = self.number / other
        return self.number
    
Calculator = Calculator(10)
print(Calculator + 5)
print(Calculator - 5)
print(Calculator * 5)
print(Calculator / 5)